Synthesis and characterization of polyurethane/zinc borate nanocomposites

Summary The effect of zinc borate (ZnB) was studied on the flame retardant and thermal properties of thermoplastic polyurethane containing huntite‐hydromagnesite. The flame retardant properties of thermoplastic polyurethane–based composites were investigated using limiting oxygen index, vertical burning test (UL 94), thermogravimetric analysis, and mass loss calorimeter. No remarkable effect of ZnB was observed on the flammability properties of composites. UL 94 rating did not change regardless of the added amount of ZnB, and the slight increase in limiting oxygen index value was observed at ratio of 1:1. The adjuvant effect of ZnB was observed during the mass loss calorimeter studies by increasing the barrier effect of the residue in the condensed phase and by increasing the formation of incombustible gasses in the gas phase. The highest fire performance was achieved at ratio of 1:1.

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Section: Resultsmentioning

confidence: 99%

“…The increase in T 5% may arise from the barrier effect of glassy coating formed during the decomposition of ZnB. This glassy surface slows down the escape of volatile degradation products 44,45. When HH and ZnB are used together, the composites decompose into 3 steps like pristine HH containing composite.…”

mentioning

confidence: 99%

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

2017

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“…Flame retardants can prevent, minimize, suppress, or stop the combustion process of materials with reducing the burning rate or extinguishing the flame. Numerous studies have showed that some silicon containing compounds, boron containing compounds, metal compounds, transitional metal oxides, and melamine compounds can exhibit as synergistic agents to increase the stability of char layer for enhancing the FR performance of the polymer composites …”

Section: Introductionmentioning

confidence: 99%

Flame resistant properties of LDPE/PLA blends containing halogen‐free flame retardant

Arslan

Dilsiz

2020

J of Applied Polymer Sci

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In this study, mixing petroleum-based low-density polyethylene (LDPE) with biodegradable poly(lactic acid) (PLA) is used as polymer matrix. Boron compounds, metal hydroxides, melamine (MLM), ammonium polyphosphate (APP), and pentaerythritol (PER) were used as reinforcement materials to improve flame resistance of polymer matrix. The composite materials were characterized by Fourier transform infrared spectroscopy, limiting oxygen index (LOI), thermogravimetric analysis, mechanical test, and scanning electron microscopy analyses. The LOI analysis showed that for samples, which included MLM, APP, and PER, the LOI values were dramatically improved. Especially, the LOI value of sample Q (LDPE80/PLA20/APP30/PER15/MLM15/ZB3) was enhanced about 95.17% compared to polymer mixing.

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“…Boric acid reference material (molecular formula: B(OH) 3 , 99.9 % pure) and zinc borate reference material were obtained from Eti Mine Works. Zinc carbonate (Kadim Chemistry, 96-97 % pure) was obtained from Colakoglu Chemicals.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of hydrophobic nanostructured zinc borate from zinc carbonate, and characterization of the product

2014

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In general, zinc oxide and boric acid are used to produce zinc borate. In this study, zinc carbonate was used instead of zinc oxide as the novel zinc source. The purpose of this study was to synthesize hydrophobic, nanostructured zinc borate (3ZnOÁ3B 2 O 3 Á3.5H 2 O) by reaction of zinc carbonate, instead of zinc oxide, with boric acid reference material, and with zinc borate reference material as seed. The modifying agents propylene glycol, kerosene, and oleic acid were used to produce hydrophobic zinc borate. Different solvents (isopropyl alcohol, ethanol, and methanol) were used to obtain a homogeneous phase. The effects of different modifying agents and solvents on the hydrophobicity and nanostructure of the product were investigated. The synthesized zinc borate was characterized by X-ray diffraction and Fourier-transform infrared spectroscopy. Contact angles were measured to determine the hydrophobicity of the products and scanning electron microscopy was used to study both the morphology and nanostructure of the products. Hydrophobic, nanostructured zinc borate was successfully produced by use of zinc carbonate instead of zinc oxide as the novel zinc source. Use of different modifying agents and solvents affected both hydrophobicity and nanostructure.

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Synthesis and characterization of polyurethane/zinc borate nanocomposites

Cited by 30 publications

References 20 publications

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

Influence of zinc borate on flame retardant and thermal properties of polyurethane elastomer composites containing huntite‐hydromagnesite mineral

Flame resistant properties of LDPE/PLA blends containing halogen‐free flame retardant

Synthesis of hydrophobic nanostructured zinc borate from zinc carbonate, and characterization of the product

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